The melody and the pads don't sound like they're following the same chord progression, and as a result, sound like they're clashing. The transition at around the 40 second mark makes no sense; you need some kind of progression leading up to that to make it work. The vocals stick out like a sore thumb, and if you're trying to do something like Bloom, you need to really work on getting them on point. I would suggest finishing the production part of this track, and redoing the vocals with everything, so you have a better idea of where the whole track is going.

ODESZA's tracks are very controlled and involve a lot of progression within a theme, which you can hear very well in Bloom. If you're looking for inspiration for the vocals, ODESZA put out instrumental versions of all their tracks on In Return, so you can compare and study the versions of Bloom with and without vocals and see how tightly the instrumentals and the vocals compliment each other. Listening to the instrumental might also be a source for inspiration on where to take this track.

I dig the sound of the lead synths a lot! I don't think you have much to worry about there.